Microsoft Fabric healthcare data model querying and identifier harmonization
The healthcare data model in Healthcare data solutions (HDS) in Microsoft Fabric is the silver layer of the medallion and is based on the FHIR R4 standard. Native FHIR® can be challenging to query using SQL because its reference properties (foreign keys) often follow varying formats, complicating query writing. One of the benefits of the silver healthcare data model is harmonizing these ids to create a simpler and more consistent query experience. Today we will walk through writing spark SQL and T-SQL queries against the silver healthcare data model. Supporting both spark SQL and T-SQL provides flexibility to users to use the compute engine they are most comfortable with and that is most suitable for the use case. The examples below leverage the synthetic sample data set that is included with Healthcare data solutions. The spark SQL queries can be written and run from a Fabric notebook while the T-SQL queries can be run from the SQL Analytics endpoint of the silver lakehouse or a T-SQL Fabric notebook. Simple query Let’s look at a simple query: finding the first instance of a Patient named “Andy”. Example spark-SQL query SELECT * FROM Patient WHERE name[0].given[0] = 'Andy' LIMIT 1 Example T-SQL query SELECT TOP(1) * FROM Patient WHERE JSON_VALUE(name_string, '$[0].given[0]') = 'Andy' Beyond syntax differences between SQL dialects, a key distinction is that T-SQL uses JSON functions to interpret complex fields, while Spark SQL can directly interact with complex types (Note: complex types are those columns of type: struct, list, or map vs. primitive types whose columns or of types like string or integer). Part of the silver transformations include adding _string suffixed column for each complex column to support querying this data from the T-SQL endpoint. Without the _string columns these complex columns would not be surfaced for T-SQL to query. You can see above that in the T-SQL version the column name_string is used while in the spark SQL version name is used directly. Note: in the example above, we are looking at the first name element, but the queries could be updated to search for the first “official” name, for example, vs. relying on an index. Keys and references Part of the value proposition of the healthcare data model is key harmonization. FHIR resources have ids that are unique, should not change, and can be logically thought of like a primary key for the resource. FHIR resources can relate to each other through references which can be logically thought of as foreign keys. FHIR references can refer to the related FHIR resource through FHIR id or through business identifiers which include a system for the identifier as well as a value (e.g. reference by MRN instead of FHIR id). Note: although ids and references can logically be thought of as primary keys and foreign keys, respectively, there is no actual key constraint enforcement in the lakehouse. In healthcare data solutions in Microsoft Fabric these resource level FHIR ids are hashed to ensure uniqueness across multiple source systems. FHIR references go through a harmonization process outlined with the example below to make querying in a SQL syntax simpler: Example raw observation reference field from sample ndjson file "subject": { "reference": "Patient/904d247a-0fc3-773a-b564-7acb6347d02c" }, Example of the observation’s harmonized subject reference in silver "subject":{ "type": "Patient", "identifier": { "value": "904d247a-0fc3-773a-b564-7acb6347d02c", "system": "FHIR-HDS", "type": { "coding": [ { "system": "http://terminology.hl7.org/CodeSystem/v2-0203", "code": "fhirId", "display": "FHIR Id" } ], "text": "FHIR Id" } }, "id": "828dda871b817035c42d7f1ecb2f1d5f10801c817d69063682ff03d1a80cadb5", "idOrig": "904d247a-0fc3-773a-b564-7acb6347d02c", "msftSourceReference": "Patient/904d247a-0fc3-773a-b564-7acb6347d02c" } You’ll notice the subject reference contains more data in silver than the raw representation. You can see a full description of what is added here. This reference harmonization makes querying from a SQL syntax easier as you don’t need to parse FHIR references like “Patient/<id>” or include joins on both FHIR ids and business identifiers in your query. If your source data only uses FHIR ids, the id property can be used directly in joins. If your source data uses a mixture of FHIR ids and business identifiers you can query by business identifier consistently as you see even when FHIR id is used, HDS adds a FHIR business identifier to the reference. NOTE: you can see examples of business identifier-based queries in the Observational Medical Outcomes Partnership (OMOP) dmfAdapter.json file which queries resources by business identifier. Here are 2 example queries looking for the top 5 body weight observations of male patients by FHIR id. Example spark-SQL query SELECT o.id FROM observation o INNER JOIN patient p on o.subject.id = p.id WHERE p.gender = 'male' AND ARRAY_CONTAINS (o.code.coding.code, '29463-7') LIMIT 5 Example T-SQL query SELECT TOP 5 o.id FROM Observation o INNER JOIN Patient p ON JSON_VALUE(o.subject_string, '$.id') = p.id WHERE p.gender = 'male' AND EXISTS ( SELECT 1 FROM OPENJSON(o.code_string, '$.coding') WITH (code NVARCHAR(MAX) '$.code') WHERE code = '29463-7' ) You’ll notice the T-SQL query is using JSON functions to interact with the string fields while the spark SQL query can natively handle the complex types like the previous query. The joins themselves though are using the id property directly as we know in this case only FHIR ids are being used. By using the id property, we do not need to parse a string representation like “Patient/<id>” to do the join. Overall we’ve shown how either spark SQL or T-SQL can be used to query the same set of silver data and also how key harmonization helps when writing SQL based queries. We welcome your questions and feedback in the comments section at the end of this post! Helpful links For more details of to start building your own queries, explore these helpful resources: Healthcare data solutions in Microsoft Fabric FHIR References T-SQL JSON functions T-SQL surface area in Fabric FHIR® is the registered trademark of HL7 and is used with permission of HL7.
A scalable and efficient approach for ingesting medical imaging data using DICOM data transformation
The transformation of Digital Imaging and Communications in Medicine (DICOM®) data is a crucial capability in healthcare data solutions (HDS). This feature allows healthcare providers to bring their DICOM® data into Fabric OneLake, enabling the ingestion, storage, and analysis of imaging metadata from various modalities such as X-rays, Computerized Tomography (CT) scans, and Magnetic Resonance Imaging (MRI) scans. By leveraging this capability, healthcare organizations can enhance their digital infrastructure, improve patient care, and streamline their data management processes. Ingestion patterns The capability provides various ingestion mechanisms for processing medical images based on the use case. For processing small datasets, comprising of medical images not more than 10 million at once, customers can either choose to upload their data to Fabric's OneLake or connect an external storage to Fabric. Let’s try to understand the rationale behind the 10 million image limit. Both the ingestion options as mentioned above setup spark structured streaming on the input DICOM® files. During file listing, one of the steps before the start of the actual processing, spark tries to gather the input files metadata like file paths, timestamps associated with the files etc. When dealing with millions of files, file listing process itself is split across multiple executor nodes. Once the metadata is fetched by the executor nodes, it is collected back at the driver node for making the execution plan. The memory allocated for storing file listing results is controlled by spark property called driver.maxResultSize. The default value for this configuration can vary based on the platform - spark in Microsoft Fabric defaults it to 4GB. Users can estimate the results collected at the driver for an input dataset by understanding the input folder structure for file paths and keeping some buffer for overhead. They need to make sure the file listing result is not more than the allocated space (4GB) to avoid Out of Memory (OOM) issues. Based on our experiments, it turned out that 10 million limit on the number of input files will give a reliable and successful run with the aforesaid memory. Now, driver.maxResultSize is a spark configuration, and it can be set to higher value to increase the allocated space for collecting file listing results. Based on spark architecture, driver memory is split into multiple portions for various purposes. Users need to be careful while increasing the value for this property as it can hamper other functioning of the spark architecture. Refer to the below table for more details on tuning the property appropriately in Microsoft Fabric. Note: Below is a reference table illustrating how various node sizes and configurations impact the file listing capacity and result sizes. The table presents rough estimates based on a test dataset deployed in the default unified folder structure in HDS. These values can serve as an initial reference but may vary depending on specific dataset characteristics. Users should not expect identical numbers in their own datasets or use cases. Node size Available memory per node (GB) Driver node vCores Executor node vCores Driver.maxResultSize (GB) File paths size (GB) Files listed (millions) Medium 56 8 8 4 3.38 10.8 Large 112 8 16 8 6.75 21.6 XL 224 8 32 16 12.81 41 XXL 400 16 64 24 15.94 51 Emergence of Inventory based ingestion Microsoft Fabric provides a variety of compute nodes which can be utilized for different use cases. The highest configuration node can be XX-Large with 512GB memory and 64 vCores. Even with such a node configuration, we can increase driver.maxResultSize to a certain limit. Thereby, posing a restriction on the dataset size which can be ingested in a single run. One way to tackle this problem is to segregate the entire dataset into smaller chunks, which is exactly the purpose of having the unified folder structure in HDS where data is segmented by default into date folders, such that the file listing result for a single chunk is within the limits of allocated memory. However, it might not be feasible to make changes every time at the data source. This is where HDS Inventory Based Ingestion comes into play, enabling the scalable ingestion of DICOM® imaging files into Fabric. Inventory based ingestion is built on an approach of segregating the file listing step from the core processing logic. This means, given the files metadata information aka inventory files, which is analogous to file listing result, users don’t need to setup the spark streaming on the folder containing DICOM® files directly rather they can consume the metadata information from inventory files and initiate the core processing logic. This way we avoid the OOM issues arising due to file listing. In case your data resides in Azure gen2 storage account, there is an out of the box service called Azure storage blob inventory to generate inventory files in parquet format. However, while inventory based ingestion does support other storages as well, users need to provide the inventory files in a required format and follow some minimal configuration changes. Capability configurations This capability includes various configuration levers which can be configured by updating deployment parameters config to tune the ingestion process for better throughput. max_files_per_trigger – this is an interface for using maxFilesPerTrigger in spark structured streaming. It is defaulted to 100K. For inventory-based ingestion, it is advisable to lower down this number to either 1 or 2 based on number of records contained in each parquet file. max_bytes_per_trigger – this is an interface for using maxBytesPerTrigger in spark structured streaming. This option doesn’t work directly with all input files as source. However, it works on parquet files as source and thus becomes relevant when using Inventory based ingestion. This is defaulted to 1GB. rows_per_partition – this option is specifically designed for Inventory based ingestion, where the number of default partitions might not be efficient for full utilization of available resources. In a given execution batch, the number of input files is divided by this number to repartition the dataframe. Default value is 250. This implies, let’s say if the current batch size is 10Million then it would create 10Million/250 = 40k partitions which translates to 40k spark tasks. DICOM® is the registered trademark of the National Electrical Manufacturers Association (NEMA) for its Standards publications relating to digital communications of medical information. Medical device disclaimer: Microsoft products and services (1) are not designed, intended or made available as a medical device, and (2) are not designed or intended to be a substitute for professional medical advice, diagnosis, treatment, or judgment and should not be used to replace or as a substitute for professional medical advice, diagnosis, treatment, or judgment. Customers/partners are responsible for ensuring solutions comply with applicable laws and regulations.Healthcare data solutions in Microsoft Fabric ALM support
Healthcare data solutions in Microsoft Fabric released support for Application Lifecycle Management (ALM). This new capability provides common tooling for your team to manage and deploy their work as part of an enterprise development and release processes.General Availability - Medical imaging DICOM® in healthcare data solutions in Microsoft Fabric
As part of the healthcare data solutions in Microsoft Fabric, the DICOM® (Digital Imaging and Communications in Medicine) data transformation is now generally available. Our Healthcare and Life Sciences customers and partners can now ingest, store, transform and analyze DICOM® imaging datasets from various modalities, such as X-rays, CT scans, and MRIs, directly within Microsoft Fabric. This was made possible by providing a purpose-built data pipeline built to top of the medallion Lakehouse architecture. The imaging data transformation capabilities enable seamless transformation of DICOM® (imaging) data into tabular formats that can persist in the lake in FHIR® (Fast Healthcare Interoperability Resources) (Silver) and OMOP (Observational Medical Outcomes Partnership) (Gold) formats, thus facilitating exploratory analysis and large-scale imaging analytics and radiomics. Establishing a true multi-modal biomedical Lakehouse in Microsoft Fabric Along with other capabilities in the healthcare data solutions in Microsoft Fabric, this DICOM® data transformation will empower clinicians and researchers to interpret imaging findings in the appropriate clinical context by making imaging pixel and metadata available alongside the clinical history and laboratory data. By integrating DICOM® pixels and metadata with clinical history and laboratory data, our customers and partners can achieve more with their multi-modal biomedical data estate, including: Unify your medical imaging and clinical data estate for analytics Establish a regulated hub to centralize and organize all your multi-model healthcare data, creating a foundation for predictive and clinical analytics. Built natively on well-established industry data models, including DICOM®, FHIR® and OMOP. Build fit-for-purpose analytics models Start constructing ML and AI models on a connected foundation of EHR and pixel-data. Enable researchers, data scientists and health informaticians to perform analysis on large volumes of multi-model datasets to achieve higher accuracy in diagnosis, prognosis and improved patient outcomes 1 . Advance research, collaboration and sharing of de-identified imaging Build longitudinal views of patients’ clinical history and related imaging studies with the ability to apply complex queries to identify patient cohorts for research and collaboration. Apply text and imaging de-identification to enable in-place sharing of research datasets with role-based access control. Reduce the cost of archival storage and recovery Take advantage of the cost-effective, HIPAA compliant and reliable cloud-based storage to back up your medical imaging data from the redundant storage of on-prem PACS and VNA systems. Improve your security posture with a 100% off-site cloud archival of your imaging datasets in case of unplanned data loss. Employ AI models to recognize pixel-level markers and patterns Deploy existing precision AI models such as Microsoft’s Project InnerEye and NVIDIA’s MONAI to enable automated segmentation of 3D radiology imaging that can help expedite the planning of radiotherapy treatments and reduce waiting times for oncology patients. Conceptual architecture The DICOM® data transformation capabilities in Microsoft Fabric continue to offer our customers and partners the flexibility to choose the ingestion pattern that best meets their existing data volume and storage needs. At a high level, there are three patterns for ingesting DICOM® data into the healthcare data solutions in Microsoft Fabric. Depending on the chosen ingestion pattern, there are up to eight end-to-end execution steps to consider from the ingestion of the raw DICOM® files to the transformation of the Gold Lakehouse into the OMOP CDM format, as depicted in the conceptual architecture diagram below. To review the eight end-to-end execution steps, please refer to the Public Preview of the DICOM® data ingestion in Microsoft Fabric. Conceptual architecture and ingestion patterns of the DICOM® data ingestion capability in Microsoft Fabric You can find more details about each of those three ingestion patterns in our public documentation: Use DICOM® data ingestion - Microsoft Cloud for Healthcare | Microsoft Learn Enhancements in the DICOM® data transformation in Microsoft Fabric. We received great feedback from our public preview customers and partners. This feedback provided an objective signal for our product group to improve and iterate on features and the product roadmap to make the DICOM® data transformation capabilities more conducive and sensible. As a result, several new features and improvements in DICOM® data transformation are now generally available, as described in the following sections: All DICOM® Metadata (Tags) are now accessible in the Silver Lakehouse We acknowledge the importance and practicality to avail all DICOM® metadata, i.e. tags, in the Silver Lakehouse closer to the clinical and ImagingStudy FHIR® resources. This makes it easier to explore any existing DICOM® tags from within the Silver Lakehouse. It also helps position the DICOM® staging table in the Bronze Lakehouse (ImagingDICOM) as a transient store, i.e., after the DICOM® metadata is processed and transformed from the bronze Lakehouse to the Silver Lakehouse, the data in the bronze staging table can now be considered as ready to be purged. This ensures cost and storage efficiency and reduces data redundancy between source files and staging tables in the bronze Lakehouse. Unified Folder Structure OneLake in Microsoft Fabric offers a logical data lake for your organization. Healthcare data solutions in Microsoft Fabric provide a unified folder structure that helps organize data across various modalities and formats. This structure streamlines data ingestion and processing while maintaining data lineage at the source file and source system levels in the bronze Lakehouse. A complete set of unified folders, including the Imaging modality and DICOM® format, is now deployed as part of the healthcare data foundation deployment experience in the healthcare data solutions in Microsoft Fabric. Purpose-built DICOM® data transformation pipeline Healthcare data foundations offer ready-to-run data pipelines that are designed to efficiently structure data for analytics and AI/machine learning modeling. We introduce an imaging data pipeline to streamline the end-to-end execution of all activities in the DICOM® data transformation capabilities. The DICOM® data transformation in the imaging data pipeline consists of the following stages: The pipeline ingests and persists the raw DICOM® imaging files, present in the native DCM format, in the bronze Lakehouse. Then, it extracts the DICOM® metadata (tags) from the imaging files and inserts them into the ImagingDICOM table in the bronze Lakehouse. The data in the ImagingDICOM will then be converted to FHIR® ImagingStudy NDJSON files, stored in OneLake. The data in the ImagingStudy NDJSON files will be transformed to relational FHIR® format and ingested in the ImagingStudy delta table in the Silver Lakehouse. Compression-by-design Healthcare data solutions in Microsoft Fabric support compression-by-design across the medallion Lakehouse design. Data ingested into the delta tables across the medallion Lakehouse are stored in a compressed, columnar format using parquet files. In the ingest pattern, when the files move from the Ingest folder to the Process folder, they will be compressed by default after successful processing. You can configure or disable the compression as needed. The imaging data transformation pipeline can also process the DICOM® files in a raw format, i.e. dcm files, and/or in a compressed format, i.e. ZIP format of dcm files/folders. Global configuration The admin Lakehouse was introduced in this release to manage cross-Lakehouse configuration, global configuration, status reporting, and tracking for healthcare data solutions in Microsoft Fabric. The admin Lakehouse system-configurations folder centralizes the global configuration parameters. The three configuration files contain preconfigured values for the default deployment of all healthcare data solutions capabilities. You can use the global configuration to repoint the data ingestion pipeline to any source folder other than the unified folder configured by default. You can also configure any of the input parameters for each activity in the imaging data transformation pipeline. Sample Data In this release, a more comprehensive sample data is provided to help you run the data pipelines in DICOM® data transformation end-to-end and explore the data processing in each step through the medallion Lakehouse, Bronze, Silver and Gold. The imaging sample data may not be clinically meaningful, but they are technically complete and comprehensive to demonstrate the full DICOM® data transformation capabilities 2 . In total, the sample data for DICOM® data transformation contains 340, 389 and 7739 DICOM® studies, series and instances respectively. One of those studies, i.e. dcm files, is an invalid DICOM® study, which was intentionally provided to showcase how the pipeline manages files that do not conform to the DICOM® format. Those sample DICOM® studies are related to 302 patients and those patients are also included in the sample data for the clinical ingestion pipeline. Thus, when you ingest the sample data for the DICOM® data transformation and clinical data ingestion, you will have a complete view that depicts how the clinical and imaging data would appear in a real-world scenario. Enhanced data lineage and traceability All delta tables in the Healthcare Data Model in the Silver Lakehouse now have the following columns to ensure lineage and traceability at the record and file level. msftCreatedDatetime: the datatime at which the record was first created in the respective delta table in the Silver Lakehouse msftModifiedDatetime: the datatime at which the record was last modified in the respective delta table in the Silver Lakehouse msftFilePath: the full path to the source file in the Bronze Lakehouse (including shortcut folders) msftSourceSystem: the source system of this record. It corresponds to the [Namespace] that was specified in the unified folder structure. As such, and to ensure lineage and traceability extend to the entire medallion Lakehouse, the following columns are added to the OMOP delta table in the Gold Lakehouse: msftSourceRecordId: the original record identifier from the respective source delta table in the Silver Lakehouse. This is important because OMOP records will have newly generated IDs. More details are provided here. msftSourceTableName: the name of the source delta table in the Silver Lakehouse. Due to the specifics of FHIR-to-OMOP mappings, there are cases where many OMOP tables in the Gold Lakehouse may be sourced from the same/single FHIR table in the Silver Lakehouse, such as the OBSERVATION and MEASUREMENT OMOP delta tables in the Gold Lakehouse that are both sources from the Observation FHIRL delta table in the Silver Lakehouse. There is also the case where a single delta table in the Gold Lakehouse may be sourced from many delta tables in the Silver Lakehouse, such as the LOCATION OMOP table that could be sourced from either the Patient or Organization FHIR table. msftModifiedDatetime: the datatime at which the record was last modified in the respective delta table in the Silver Lakehouse. In summary, this article provides comprehensive details on how the DICOM® data transformation capabilities in the healthcare data solutions in Microsoft Fabric offer a robust and all-encompassing solution for unifying and analyzing the medical imaging data in a harmonized pattern with the clinical dataset. We also listed major enhancements to these capabilities that are now generally available for all our healthcare and life sciences customers and partners. For more details, please refer to our public documentation: Overview of DICOM® data ingestion - Microsoft Cloud for Healthcare | Microsoft Learn 1 S. Kevin Zhou, Hayit Greenspan, Christos Davatzikos, James S. Duncan, Bram van Ginneken, Anant Madabhushi, Jerry L. Prince, Daniel Rueckert, Ronald M. Summers A review of deep learning in medical imaging: Imaging traits, technology trends, case studies with progress highlights, and future promises. arXiv:2008.09104 2 Microsoft provides the Sample Data in the Healthcare data solutions in Microsoft Fabric on an "as is" basis. This data is provided to test and demonstrate the end-to-end execution of data pipelines provided within the Healthcare data solutions in Microsoft Fabric. This data is not intended or designed to train real-world or production-level AI/ML models, or to develop any clinical decision support systems. Microsoft makes no warranties, express or implied, guarantees or conditions with respect to your use of the datasets. To the extent permitted under your local law, Microsoft disclaims all liability for any damages or losses, including direct, consequential, special, indirect, incidental, or punitive, resulting from your use of this data. The Sample Data in the Healthcare data solutions in Microsoft Fabric is provided under the Community Data License Agreement – Permissive – Version 2.0 DICOM® is the registered trademark of the National Electrical Manufacturers Association (NEMA) for its Standards publications relating to digital communications of medical information. FHIR® is a registered trademark of Health Level Seven International, registered in the U.S. Trademark Office, and is used with their permission.Register for the upcoming live webinar to see an end-to-end demo of Microsoft Fabric!
Health & Life Sciences Fabric User Group present: Real-World Fabric: Ingest 250M Rows of Healthcare Data in Under 2 Hours Live webinar Tuesday, December 10 12:00-1:00 PM ET Register here Are you tired of watching Fabric demos where you can't use the tools hands-on and push them to the limits? Would you like to test out Microsoft Fabric with 250 million rows of real data? Maybe you need a solid demo or you have a real Healthcare use case for 10 years of #OpenData CMS Medicare Part D data? This session will walk you through the steps to easily deploy a solution using Fabric Notebooks, OneLake (Lakehouse), Warehouse, Pipelines, a Direct Lake Semantic Model, Power BI, and with everything optimized for use with the Fabric Copilots. All you need is a Fabric Workspace and a Power BI Pro license. You can even spin up an F64, deploy the solution from GitHub, and then pause the capacity while not in use. Inder Rana and Greg Beaumont will walk you through the process by which to install the solution, end-to-end, without writing any code. The entire 250M row medallion Lakehouse architecture will even be fully deployed during the session, end-to-end from the CMS servers to a Gold Lakehouse in Fabric.
Providing a unified healthcare analytics solution for the era of AI
This blog is part of a series that explores the recent announcement of the public preview of healthcare data solutions in Microsoft Fabric. Healthcare data solutions in Microsoft Fabric is a comprehensive, end-to-end analytics SaaS platform that allows you to ingest, store, and analyze healthcare data from a variety of sources, including electronic health records and picture archiving and communication systems. With this platform, you can unlock new insights and drive value from your healthcare data.
Empowering multi-modal analytics with the medical imaging capability in Microsoft Fabric
This blog is part of a series that explores the recent announcement of the public preview of healthcare data solutions in Microsoft Fabric. The DICOM® (Digital Imaging and Communications in Medicine) data ingestion capability within the healthcare data solutions in Microsoft Fabric enables the storage, management, and analysis of imaging metadata from various modalities, including X-rays, CT scans, and MRIs, directly within Microsoft Fabric. It fosters collaboration, R&D and AI innovation for healthcare and life science use cases. Our customers and partners can now integrate DICOM® imaging datasets with clinical data stored in FHIR® (Fast Healthcare Interoperability Resources) format. By making imaging pixels and metadata accessible alongside clinical history and laboratory data, it enables clinicians and researchers to interpret imaging findings in the appropriate clinical context. This leads to enhanced diagnostic accuracy, informative clinical decision-making, and ultimately, improved patient outcomes.
